a refillable tank lighter,a bit heavy in the pocket but was kept in the day bag on canoe trips for lighting fires in the evening.
a small Bic,light weight and carried in pocket.also this lighter was "altered" from directions found on the web to throw a larger flame than it was made to do.
wood kitchen matches in a small WP plastic bottle.
the Aviation Spark-Lite with three REI flamers and a striker,sealed with duct tape as a "last ditch" fire lighter.
i have found it's not the lighting but keeping a fire going that's the problem.a knife of any kind to scrape the wet bark or moss from firewood or split small branches should be part of a fire kit if you don't carry a belt knife.